Electrical Conductivity of TiO ₂ ‐V ₂ O ₅ ‐P ₂ 0 ₅ Glasses

Abstract

The dc conductivities (σ) of V 2 O 5 ‐P 2 O 5 glasses containing up to 30 mol% TiO 2 were measured at T=100° to ∼10°C below the glass‐transition temperature. Dielectric constants from 30 to 10 6 Hz, densities, and the fraction of reduced V ion were measured at room temperature. The conduction mechanism was considered to be small polaron hopping between V ions, as previously reported for V 2 O 5 ‐P 2 O 5 glass. The temperature dependence of σ was exponential with σ = σ 0 exp(‐W/kT ) in the high‐temperature range. When part of the P 2 O 5 was replaced by TiO 2, σ increased and W decreased. The hopping energy depended on the reciprocal dielectric constant which, in this case, increased with increasing TiO 2 content.